Machines with PA8000-PA8700 CPUs crash during startup while we measure
and calculate a good threshold for the TLB flush.
Avoid this crash by simply skipping the test until we figure out what
really triggers the crash.
Cc: <stable@xxxxxxxxxxxxxxx> # v3.18+
Signed-off-by: Helge Deller <deller@xxxxxx>
diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index c263301..63c10ea 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -393,6 +393,14 @@ void __init parisc_setup_cache_timing(void)
/* calculate TLB flush threshold */
+ /* skip TLB measure on PA8000-PA8700 CPUs */
+ if (boot_cpu_data.cpu_type >= pcxu &&
+ boot_cpu_data.cpu_type <= pcxw2) {
+ threshold = max(cache_info.it_size, cache_info.dt_size);
+ threshold *= PAGE_SIZE;
+ goto set_tlb_threshold;
+ }
+
alltime = mfctl(16);
flush_tlb_all();
alltime = mfctl(16) - alltime;
@@ -411,6 +419,8 @@ void __init parisc_setup_cache_timing(void)
alltime, size, rangetime);
threshold = PAGE_ALIGN(num_online_cpus() * size * alltime / rangetime);
+
+set_tlb_threshold:
if (threshold)
parisc_tlb_flush_threshold = threshold;
printk(KERN_INFO "TLB flush threshold set to %lu KiB\n",
--
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